EP3213427A1 - Procédé et appareil de transmission de canal de commande dans un système d'agrégation de porteuses intracellulaire - Google Patents
Procédé et appareil de transmission de canal de commande dans un système d'agrégation de porteuses intracellulaireInfo
- Publication number
- EP3213427A1 EP3213427A1 EP15855172.1A EP15855172A EP3213427A1 EP 3213427 A1 EP3213427 A1 EP 3213427A1 EP 15855172 A EP15855172 A EP 15855172A EP 3213427 A1 EP3213427 A1 EP 3213427A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- subframe
- format
- control channel
- downlink
- uplink control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000002776 aggregation Effects 0.000 title description 6
- 238000004220 aggregation Methods 0.000 title description 6
- 238000004891 communication Methods 0.000 claims abstract description 35
- 230000004044 response Effects 0.000 claims abstract description 21
- 125000004122 cyclic group Chemical group 0.000 claims description 24
- 230000005540 biological transmission Effects 0.000 abstract description 53
- 238000005516 engineering process Methods 0.000 abstract description 21
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000036541 health Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000010295 mobile communication Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000969 carrier Substances 0.000 description 4
- 238000004590 computer program Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
Definitions
- the present disclosure relates to a method and apparatus for transmitting/receiving signals in a mobile communication system. More particularly, the present disclosure relates to a control channel transmission method and apparatus for use in an intra-cell carrier aggregation system
- the 5G or pre-5G communication system is also called a ‘beyond 4G network’ or a ‘post long term evolution (LTE) system’.
- the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates.
- mmWave e.g. 60 GHz bands
- MIMO massive multiple-input multiple-output
- FD-MIMO full dimensional MIMO
- array antenna analog beamforming, and large scale antenna techniques are discussed with respect to 5G communication systems.
- RANs cloud radio access networks
- D2D device-to-device
- CoMP coordinated multi-points
- FQAM quadrature amplitude modulation
- SWSC sliding window superposition coding
- ACM advanced coding modulation
- FBMC filter bank multi carrier
- NOMA non-orthogonal multiple access
- SCMA sparse code multiple access
- the Internet which is a human centered connectivity network where humans generate and consume information
- IoT Internet of things
- IoE Internet of everything
- sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “security technology”
- M2M machine-to-machine
- MTC machine type communication
- IoT Internet technology services
- IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications.
- IT information technology
- 5G communication systems to IoT networks.
- technologies such as a sensor network, MTC, and M2M communication may be implemented by beamforming, MIMO, and array antennas.
- Application of a cloud RAN as the above-described big data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
- Mobile communication systems were developed to provide the subscribers with voice communication services on the move. With the rapid advance of technologies, the mobile communication systems have evolved to support high speed data communication services beyond the early voice-oriented services. However, the limited resource and user requirements for higher speed services in the current mobile communication system spur the evolution to more advanced mobile communication systems.
- LTE-A The LTE?advanced (LTE-A) of the 3rd generation partnership project (3GPP) is a technology for realizing high-speed packet-based communications at the data rate of up to 100 Mbps.
- LTE-A the number of cells serving a user equipment (UE) increases while feedback for all of the serving cells are transmitted through a primary cell (PCell).
- PCell primary cell
- all of the cells serving one UE operate in the same duplex mode. Accordingly, all of the cells may operate in the frequency division duplex (FDD) mode or time division duplex (TDD) mode.
- FDD frequency division duplex
- TDD time division duplex
- the TDD mode can be categorized into one of the static TDD mode in which the uplink (UL)-downlink (DL) configuration is maintained and the dynamic TDD mode in which the UL-DL configuration varies by means of the system information, higher layer signal, or DL common control channel.
- an aspect of the present invention provides a method and apparatus for transmitting a control channel in a communication system including carrier aggregation with dirreent duplex modes.
- an aspect of the present disclosure is to provide a method and apparatus for transmitting/receiving signals in a mobile communication system.
- a method by a terminal in a communication system includes receiving configuration information including information on an uplink (UL) control channel format, receiving downlink (DL) data on at least one of a first subframe of a primary cell and a first subframe of a secondary cell, and transmitting a response corresponding to the DL data on a second subframe of the primary cell based on the configuration information and the first subframe of the secondary cell.
- UL uplink
- DL downlink
- a method by a base station in a communication system includes transmitting configuration information including information on a UL control channel format, transmitting DL data on at least one of a first subframe of a primary cell and a first subframe of a secondary cell, and receiving a response corresponding to the DL data on a second subframe of the primary cell based on the configuration information and the first subframe of the secondary cell.
- a terminal in a communication system includes a transceiver configured to transmit a signal and to receive another signal and a controller configured to receive configuration information including information on a UL control channel format, to receive DL data on at least one of a first subframe of a primary cell and a first subframe of a secondary cell, and transmit a response corresponding to the DL data on a second subframe of the primary cell based on the configuration information and the first subframe of the secondary cell.
- a base station in a communication system includes a transceiver configured to transmit a signal and to receive another signal and a controller configured to transmit configuration information including information on a UL control channel format, to transmit DL data on at least one of a first subframe of a primary cell and a first subframe of a secondary cell, and to receive a response corresponding to the DL data on a second subframe of the primary cell based on the configuration information and the first subframe of the secondary cell.
- FIGS. 1A and 1B are diagrams illustrating communication systems according to various embodiments of the present disclosure
- FIGS. 2A, 2B, and 2C are diagrams illustrating control channel transmission methods according to various embodiments of the present disclosure
- FIGS. 3A and 3B are diagrams illustrating configurations of a special subframe according to various embodiments of the present disclosure
- FIGS. 4A and 4B are flowcharts illustrating the operations of the evolved node B (eNB) and the user equipment (UE) according to various embodiments of the present disclosure
- FIG. 5 is a diagram illustrating an eNB apparatus according to an embodiment of the present disclosure.
- FIG. 6 is a diagram illustrating the UE apparatus according to an embodiment of the present disclosure.
- each block of flowcharts and the combinations of the flowcharts can be performed by computer program instructions.
- computer program instructions may be mounted in a processor of a universal computer, a special computer or other programmable data processing equipment, instructions performed through a processor of a computer or other programmable data processing equipment generates means for performing functions described in block(s) of the flowcharts.
- the computer program instructions may be stored in a computer available or computer readable memory capable of orienting a computer or other programmable data processing equipment to implement functions in a specific scheme, instructions stored in the computer available or computer readable memory may produce manufacturing articles involving an instruction means executing functions described in block(s) of flowcharts.
- the computer program instructions may be mounted on a computer or other programmable data processing equipment, a series of operations are performed in the computer or other programmable data processing equipment to create a process executed by the computer such that instructions performing the computer or other programmable data processing equipment may provide operations for executing functions described in block(s) of flowcharts.
- each block may indicate a part of a module, a segment, or a code including at least one executable instruction for executing specific logical function(s). It should be noticed that several execution examples may generate functions described in blocks out of an order. For example, two continuously shown blocks may be simultaneously performed, and the blocks may be performed in a converse order according to corresponding functions.
- the term “ ⁇ unit” refers to software or a hardware structural element such as field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC), and the “ ⁇ unit” perform some roles.
- the “ ⁇ unit” is not limited to software or hardware.
- the “ ⁇ unit” can be configured to be stored in an addressable storage medium and to play at least one processor. Accordingly, for example, the “ ⁇ unit” includes software structural elements, object-oriented software structural elements, class structural elements, task structural elements, processes, functions, attributes, procedures, subroutines, segments of a program code, drivers, firmware, microcode, circuit, data, database, data structures, tables, arrays, and variables.
- structural elements and “ ⁇ units” may be engaged by the smaller number of structural elements and “ ⁇ units”, or may be divided by additional structural elements and “ ⁇ units”. Furthermore, structural elements and “ ⁇ units” may be implemented to play a device or at least one central processing unit (CPU) in a security multimedia card.
- CPU central processing unit
- An embodiment of the present disclosure is characterized by applying the uplink (UL) control channel transmission timing of the frequency division duplex (FDD) cell to the transmission of the UL control channel corresponding to the downlink (DL) data of the time division duplex (TDD) cell.
- UL uplink
- FDD frequency division duplex
- DL downlink
- TDD time division duplex
- Another embodiment of the present disclosure is characterized by transmitting the UL control channel using the UL control format designed by taking only the UL control information corresponding to the DL data of the FDD cell into consideration when transmitting the UL control channel corresponding to the subframe which cannot carry the DL data in the TDD cell.
- LTE long term evolution
- LTE-A LTE-advanced
- Orthogonal frequency division multiple access is a multicarrier modulation technique for transmitting data using multiple carriers in such a way of parallelizing symbol streams input in series and modulating the symbols onto orthogonal multiple carriers, i.e. subcarriers channels.
- the modulation signal is positioned on the 2-dimensional time-frequency resource.
- the resource is divided into OFDM symbols on the time axis, and they are orthogonal.
- the resource is divided into subcarriers on the frequency axis, and they are orthogonal. That is, in the OFDM scheme it is possible to indicate one smallest resource unit by designating a specific OFDM symbol on the time axis and one subcarrier on the frequency axis, and this resource unit is referred to as resource element (RE).
- RE resource element
- a physical channel is a channel of a physical layer for transmitting a modulation symbol obtained by modulating one or more encoded bit strings.
- an information string is transmitted by configuring a plurality of physical channels according to the use of the information string or a receiver for receiving the information string. Which RE one physical channel should be located on for transmission should be promised in advance between a transmitter and a receiver, and a rule for the same is referred to as “mapping”.
- the DL band is divided into a plurality of resource blocks (RBs), and each physical RB (PRB) consists of 12 subcarriers arranged on the frequency axis and 14 or 12 OFDM symbols arranged on the time axis.
- PRB is the basic unit of resource allocation.
- the reference signal is the signal transmitted by the evolved node B (eNB) in order for the user equipment (UE) to estimate channels, and the LTE system has common RS (CRS) and demodulation RS (DMRS) as a dedicated RS.
- CRS common RS
- DMRS demodulation RS
- the CRS is the RS transmitted across the whole DL band such that all UEs can receive for use in configuring feedback information or demodulating the control and data channels.
- the DMRS is also the RS transmitted across the whole DL band such that a specific UE can receive for use in data channel demodulation and channel estimation but not for use in configuring feedback information. Accordingly, the DMRS is transmitted on the PRB in which the UE is scheduled.
- a subframe is divided into two slots, each of 0.5 msec, i.e. the first and second slots.
- the physical dedicated control channel (PDCCH) transmitted in the control channel region and enhanced PDCCH (ePDCCH) transmitted in the data channel region are distributed on the time axis. This makes it possible to receive and demodulate the control channel signal quickly.
- the PDCCH regions are positioned across the whole DL band in such a way that a control channel is subdivided into control channel elements distributed in the whole DL band.
- control channel PUCCH
- data channel Physical UL shared channel (PUSCH)
- acknowledgement channel and other feedback information corresponding to the DL data channel are transmitted, if there is no data channel, through the control channel and, if there is data channel, through the data channel.
- FIGS. 1A and 1B are diagrams illustrating communication systems according to various embodiments of the present disclosure.
- FIG. 1A shows the case where a time division duplex (TDD) cell 102 and a frequency division duplex (FDD) cell 103 coexist in network of the eNB 101 and thus a UE 104 communicates data with the eNB through the TDD cell 102 and FDD cell 103.
- the UL transmission is performed through the FDD cell 103 when the FDD cell is the primary cell (PCell).
- FIG. 1B shows the case where a macro eNB 111 for a large coverage area and a pico eNB 112 for increase of data throughput are deployed and thus the UE 114 communicates data with the macro eNB 111 in the FDD mode 116 and the pico eNB 112 in the TDD mode 115.
- the UL transmission is performed through the macro eNB 111 when the macro eNB is the PCell. It is assumed that the macro eNB 111 and the pico eNB 112 have an ideal backhaul network. This makes it possible for fast inter-eNB communication through the X2 interface 113 and thus the pico eNB 112 can acquire the control information transmitted in UL to the macro eNB through the X2 interface 113 in real time.
- FIGS. 2A, 2B, and 2C are diagrams illustrating control channel transmission methods according to various embodiments of the present disclosure. Descriptions are made of the first and second embodiments of transmitting a UL control channel corresponding to the DL data through the TDD and FDD cells by applying the UL control channel transmission timing of the FDD cell.
- FIG. 2A shows UL channel transmission according to the first embodiment of the present disclosure, in the situation where two cells operating in different duplex modes coexist.
- the PCell operates in the FDD mode (referred to as FDD cell 201) with the DL frequency f1 and UL frequency f2.
- the secondary cell (SCell) operates in the static TDD mode (referred to as TDD cell 202) with the DL and UL subframes set according to the TDD UL-DL configuration #4.
- the TDD UL-DL configuration is for explaining this embodiment, but the technical features according to various embodiments of the present disclosure can be applied to the case where any of other configuration is adopted.
- the UE may acquire the DL frequency of the PCell through the cell search process and the UL frequency f2 of the PCell from the system information of the eNB.
- the UE also may acquire the TDD UL-DL configuration for the SCell from higher layer information.
- HARQ-ACK hybrid automatic repeat request acknowledgement
- PDSCH physical downlink shared channel
- the HARQ-ACK corresponding to the PDSCH 207 is transmitted at the UL subframe #4 of the frequency f2 of the FDD cell after 4 subframes according to the UL control channel transmission timing of the FDD cell.
- the HARQ-ACK corresponding to the PDSCH 207 is transmitted at the UL subframe #6 after 6 subframes in the TDD UL-DL configuration #4.
- the HARQ-ACK corresponding to the PDSCH 206 is transmitted at the UL subframe #4 on the frequency f2 of the FDD cell 201 after 4 subframes along with the HARQ-ACK corresponding to the PDSCH 207 using the PUCCH format 1b with channel selection as denoted by reference number 208.
- the HARQ-ACK corresponding to the PDSCH 203 is transmitted at the UL subframe #6 after 4 subframes.
- the PDSCH 204 of the static TDD cell 202 cannot be scheduled because the subframe #2 of the static TDD cell 202 is UL.
- the UL subframe #6 of the frequency f2 of the FDD cell 201 carries only the HARQ-ACK corresponding to the PDSCH 203 of the FDD cell 201 in the PUCCH format 1a/1b as denoted by reference number 205.
- the UL control channels have to be transmitted in the same UL control channel format at every UL subframe.
- the UL control channel is always transmitted in the format 1b with channel selection regardless of PDSCH scheduling in every UL subframe.
- the subframe #2 of the static TDD cell 202 is the UL subframe, it is agreed to use the simple transmission format such as PUCCH format 1a or 1b between the eNB and the UE in a situation where the PDSCH 204 cannot be scheduled and, in this case, the UE transmits the HARQ-ACK in the PUCCH format 1a/1b.
- This make it possible to reduce the UL control channel reception complexity at the subframe and to use the UL control channel transmission resources configured for the format 1b with channel selection for other purposes, e.g. UL data transmission.
- the UE may receive the configuration information related to UL control channel format from the eNB and DL data in at least one of first frames of the primary and secondary cells and transmit the acknowledgement corresponding to the DL data in the secondary subframe of the PCell based on the configuration information and the first subframe of the SCell.
- the UL control channel format may be the first format, and it may be possible to transmit the acknowledgement corresponding to the DL data received in another format (e.g. the second format) according to the first subframe of the SCell.
- the first subframe of the SCell is a UL subframe, a special subframe with the normal DL cyclic prefix configuration 0 and 5, or a special subframe with the extended DL cyclic prefix configuration 0 and 4, the UE may transmit the acknowledgement corresponding to the received DL data in the second format; and the first format is a PUCCH and the second format is the PUCCH format 1a/1b.
- the UL control channel format may be the PUCCH format 3 for which the HARQ-ACK bit may be determined based on the numbers of the serving cells of which the first subframes are DL, the serving cells of which special subframes are not following the normal UL cyclic prefix configurations 0 and 5, and the serving cells of which special subframes are not following the extended cyclic prefix configurations 0 and 4; and the acknowledgement corresponding to the DL data may be transmitted based on the determined HARQ-ACK bit.
- the UE transmits the HARQ-ACK in the PUCCH format 3 when total two cells, i.e. the PCell and SCell, are configured to the UE and the use of PUCCH format 3 is configured by a higher layer signal. If the PDSCH 207 of the static TDD cell 202 is scheduled in the subframe #0, the HARQ-ACK corresponding to the PDSCH 207 is transmitted at the UL subframe of the frequency f2 of the FDD cell 201 after 4 subframes according to the UL control channel transmission timing of the FDD cell.
- the HARQ-ACK corresponding to the PDSCH 207 is transmitted at the UL subframe #6 after 6 subframes in the TDD UL-DL configuration #4.
- the HARQ-ACK corresponding to the PDSCH 206 calculated as the payload size along with the HARQ-ACK corresponding to the PDSCH 207 and then transmitted at the UL subframe #4 on the frequency f2 of the FDD cell 201 after 4 subframes using the PUCCH format 3 as denoted by reference number 208.
- the HARQ-ACK corresponding to the PDSCH 203 is transmitted at the UL subframe #6 of the frequency f2 of the FDD cell 201 after 4 subframes.
- the PDSCH 204 of the static TDD cell 202 cannot be scheduled because the subframe #2 of the static TDD cell 202 is the UL subframe.
- the UL subframe #6 of the frequency f2 of the FDD cell 201 carries only the HARQ-ACK corresponding to the PDSCH 203 of the FDD cell 201 in the PUCCH format 3 as denoted by reference number 205.
- the HARQ-ACK having the HARQ-ACK payload size calculated by multiplying the number of carriers aggregated and the number of transport blocks (TBs) in accordance with the transmission modes of the cells (however, the bundling window size is further multiplied in the carrier aggregation for TDD cells) is transmitted in the form of the UL control channel in the UL subframe. Accordingly, the HARQ-ACK payload size of the PUCCH format 3 per subframe is not changed.
- the UE does not apply the HARQ payload size calculated for the HARQ-ACKs corresponding to the PDSCHs that cannot be transmitted in the UL subframe but apply only the payload size calculated for the FDD cell 201 to the PUCCH format 3 and transmits the UL control channel in the PUCCH format 3.
- the PUCCH format 3 to which the HARQ-ACK payload size optimized for the subframe is applied, it is possible to reduce the transmit power of the UE while guaranteeing the reception performance of the eNB.
- FIG. 2B shows the UL control channel transmission according to the second embodiment of the present disclosure, in the situation where two cells operating in different duplex modes coexist.
- the PCell operates in the FDD mode (referred to as FDD cell 211) with the DL frequency f1 and UL frequency f2.
- the SCell operates in the static TDD mode (referred to as TDD cell 212) with the DL and UL subframes set according to the TDD UL-DL configuration #4.
- the UE may acquire the DL frequency of the PCell through the cell search process and the UL frequency f2 of the PCell from the system information of the eNB.
- the UE may also acquire the TDD UL-DL configuration for the SCell from higher layer information.
- the PDSCH 214 is scheduled in the subframe #1 of the static TDD cell 212, the HARQ-ACK corresponding to the PDSCH 214 is transmitted at the UL subframe #5 of the frequency f2 of the FDD cell 211 after 4 subframes according to the UL control channel transmission timing of the FDD cell.
- the subframe #1 of the TDD cell 212 is a special subframe consisted of downlink pilot time slot (DwPTS) 216, guard period (GP) 217, uplink pilot time slot (UpPTS) 218.
- the DwPTS 216 is the duration for succeeding to the DL transmission at the DL subframe (#0) smoothly
- the GP 217 is the duration for securing the time necessary for switching radio frequency (RF) from DL to UL
- UpPTS 218 is the duration for starting UL transmission such that the next UL subframe (#2) succeeds to the UL transmission smoothly.
- the lengths of the DwPTS, GP, and UpPTS on the time axis are defined in the special subframe configuration which is transmitted to the UE through a higher layer signal.
- the PDSCH 214 may be transmitted at the DwPTS 216. However, it is configured to prohibit transmitting PDSCH when the DwPTS 216 is shorter than 4 OFDM symbols. The reason is that there is no space enough for transmitting PDSCH because the PDCCH transmission may require up to 3 OFDM symbols.
- the HARQ-ACK corresponding to the PDSCH 214 is transmitted at the UL subframe #7 after 6 subframes in the TDD UL-DL configuration #4.
- the HARQ-ACK corresponding to the PDSCH 213 is transmitted at the UL subframe #5 on the frequency f2 of the FDD cell 211 after 4 subframes along with the HARQ-ACK corresponding to the PDSCH 214 in the configured PUCCH format as denoted by reference number 215.
- the PUCCH format is configured by taking both the PDSCHs in the DL subframes of the FDD and TDD cells into consideration.
- FIG. 2C shows the UL control channel transmission according to the third embodiment of the present disclosure, in the situation where two cells operating in different duplex modes coexist.
- the PCell operates in the FDD mode (referred to as FDD cell 221) with the DL frequency f1 and UL frequency f2.
- the SCell operates in the static TDD mode 222 with the DL and UL subframes set according to the TDD UL-DL configuration #4.
- the UE may acquire the DL frequency of the PCell through the cell search process and the UL frequency f2 of the PCell from the system information of the eNB.
- the UE may also acquire the TDD UL-DL configuration for the SCell from higher layer information.
- the HARQ-ACK corresponding to the PDSCH 223 is transmitted at the UL subframe #5 on the frequency f2 of the FDD cell 221 after 4 subframes.
- the subframe #1 of the static TDD cell 222 is a special subframe with DwPTS 226 consisted of 3 OFDM symbols, the PDSCH 224 of the static TDD cell 222 cannot be scheduled in the subframe #1.
- the lengths of the DwPTS 226, GP 227, and UpPTS 228 on the time axis are defined in the special subframe configuration which is transmitted to the UE through a higher layer signal.
- the UL subframe #5 on the frequency f2 of the FDD cell 221 may carry only the HARQ-ACK corresponding to the PDSCH 223 of the FDD cell 221 in the PUCCH format 1a/1b as denoted by reference number 225.
- the UL control channels have to be transmitted in the same UL control channel format at every UL subframe.
- the UL control channel is always transmitted in the format 1b with channel selection regardless of PDSCH scheduling in every UL subframe.
- the subframe #1 of the static TDD cell 222 is the UL subframe
- the simple transmission format such as PUCCH format 1a or 1b between the eNB and the UE in a situation where the PDSCH 204 cannot be scheduled and, in this case, the UE transmits the HARQ-ACK in the PUCCH format 1a/1b.
- This make it possible to reduce the UL control channel reception complexity at the subframe and to use the UL control channel transmission resources configured for the format 1b with channel selection for other purposes, e.g. UL data transmission.
- the HARQ-ACK corresponding to the PDSCH 203 is transmitted at the UL subframe #5 of the frequency f2 of the FDD cell 221 after 4 subframes.
- the subframe #1 of the static TDD cell 222 is the special subframe with DwPTS 226 consisted of 3 OFDM symbols, the PDSCH 224 of the static TDD cell 222 cannot be scheduled in the subframe #1.
- the lengths of the DwPTS 226, GP 227, and UpPTS 228 on the time axis are defined in the special subframe configuration which is transmitted to the UE through a higher layer signal.
- the UL subframe #5 on the frequency f2 of the FDD cell 221 may carry only the HARQ-ACK corresponding to the PDSCH 223 of the FDD cell 221 in the PUCCH format 3 as denoted by reference number 225.
- the HARQ-ACK having the HARQ-ACK payload size calculated by multiplying the number of carriers aggregated and the number of TBs in accordance with the transmission modes of the cells (however, the bundling window size is further multiplied in the carrier aggregation for TDD cells) is transmitted in the form of the UL control channel in the UL subframe. Accordingly, the HARQ-ACK payload size of the PUCCH format 3 per subframe is not changed.
- the UE does not apply the HARQ payload size calculated for the HARQ-ACKs corresponding to the PDSCHs that cannot be transmitted in the special subframe but apply only the payload size calculated for the FDD cell 221 to the PUCCH format 3 and transmits the UL control channel in the PUCCH format 3. .
- the PUCCH format 3 to which the HARQ-ACK payload size optimized for the subframe is applied, it is possible to reduce the transmit power of the UE while guaranteeing the reception performance of the eNB.
- FIGS. 3A and 3B are diagrams illustrating configurations of a special subframe according to various embodiments of the present disclosure.
- 10 special subframe configurations (FIG. 3A) and 8 special subframe configurations (FIG. 3B), which define the lengths of DwPTS 304 and 314, GP 305 and 315, and UpPTS 306 and 316, are specified for the respective cases of using the normal cyclic prefix and extended cyclic prefix in DL.
- the UE can check whether the DL cyclic prefix is the normal cyclic prefix or the extended cyclic prefix by decoding the synchronization signal received in the serving cell.
- the special subframe configuration #0 302 and special subframe configuration #5 303 have the DwPTS 304 consisted of 3 OFDM symbols which are not enough for transmitting PDSCH.
- the special subframe configurations 311 for the case of using the extended cyclic prefix in DL the special subframe configuration #0 312 and special subframe configuration #4 313 have the DwPTS 314 consisted of 3 OFDM symbols which are not enough for transmitting PDSCH. Accordingly, if the TDD cell operates with the special subframe configuration #0 302 or the special subframe configuration #5 303 and the normal cyclic prefix in DL, the embodiment of FIG. 2C can be applied; and otherwise if the TDD cell operates with the configuration #0 312 or the special subframe configuration #4 313 and the normal cyclic prefix in DL, the embodiment of FIG. 2C can be applied.
- FIGS. 4A and 4B are flowcharts illustrating the operations of the eNB and the UE according to various embodiments of the present disclosure.
- the eNB sends the UE the information on the FDD cell (PCell) and the TDD cell (SCell) and the PUCCH format configuration (PUCCH format 3 or PUCCH format 1b with channel selection) for use at the UE in transmitting the UL control information corresponding to the DL data through the two cells.
- the information on the FDD and TDD cells may be the UL and DL frequency information of the FDD cell or the UL-DL configuration information and special subframe configuration information of the TDD cell.
- the information on the FDD and TDD cells may be transmitted to the UE through a system information or higher layer information.
- the eNB schedules the DL data for the UE in the FDD and TDD cells in the subframe #n at operation 402.
- the eNB determines whether the subframe #n is the special subframe in the special subframe configuration #k for the TDD cell at operation 403.
- the k is the index of the special subframe configuration with DwPTS of 3 OFDM symbols so as not to transmit PDSCH; and if the normal cyclic prefix is used in DL, k is 0 or 5 and, otherwise if the extended cyclic prefix is used in DL, k is 0 or 4.
- the eNB receives the control information corresponding to the DL data of the FDD cell at the subframe #(n+4) of the FDD cell at operation 404.
- the eNB has transmitted the configuration information indicating the use of the PUCCH format 1b with channel selection at operation 401, it receives only the control information corresponding to the DL data of the FDD cell under the assumption of the PUCCH format 1a/1b. If the eNB has determined not to schedule the DL data in the FDD cell in the subframe #n at operation 402, it may not receive the control information corresponding to the DL data of the FDD cell at the subframe #(n+4) of the FDD cell.
- the eNB receives the control information corresponding to the DL data of the FDD cell and the control information corresponding to the DL data of the TDD cell together at operation 405.
- the eNB has transmitted the configuration information indicating the use of the PUCCH format 1b with channel selection to the UE at operation 401, it receives the control information corresponding to the DL data of the FDD cell and the control information corresponding to the DL data of the TDD cell together under the assumption of the PUCCH format 1b with channel selection.
- the eNB If the eNB has transmitted the configuration information indicating the UEs of the PUCCH format 3 to the UE at operation 401, it receives both the control information corresponding to DL data of the FDD and TDD cells under the assumption of the PUCCH format 3 to which the HARQ-ACK payload sizes of both the FDD and TDD cells are applied.
- the UE receives the information on the FDD cell (PCell) and the TDD cell (SCell) and the PUCCH format configuration (PUCCH format 3 or PUCCH format 1b with channel selection) for use at the UE in transmitting the UL control information corresponding to the DL data through the two cells from the eNB.
- the information on the FDD and TDD cells may be the UL and DL frequency information of the FDD cell or the UL-DL configuration information and special subframe configuration information of the TDD cell.
- the information on the FDD and TDD cells is received through a system information or higher layer information.
- the UE receives the DL data of the FDD and TDD cells from the eNB at the subframe #n at operation 412.
- the UE determines whether the subframe #n of the TDD cell is the special subframe in the special subframe configuration #k at operation 413.
- the k is the index of the special subframe configuration with DwPTS of 3 OFDM symbols so as not to transmit PDSCH; and if the normal cyclic prefix is used in DL, k is 0 or 5 and, otherwise if the extended cyclic prefix is used in DL, k is 0 or 4.
- the UE can check whether the DL cyclic prefix of the TDD cell is the normal cyclic prefix or the extended cyclic prefix by decoding the synchronization signal of the TDD cell before or after receiving the information on the cells and PUCCH formation configuration at operation 411.
- the UE transmits the control information corresponding to the DL data of the FDD cell at the subframe #(n+4) of the FDD cell at operation 413.
- the UE has received the configuration information indicating the use of the PUCCH format 1b with channel selection from the eNB at operation 411, it transmits only the control information corresponding to the DL data of the FDD cell in the PUCCH format 1a/1b instead of the PUCCH format 1b with channel selection as the configured PUCCH format.
- the UE If the UE has received the configuration information indicating the use of the PUCCH format 3 from the eNB at operation 411, the UE transmits only the control information corresponding to the DL data of the FDD cell in the PUCCH format 3 to which the HARQ-ACK payload size is applied instead of the PUCCH format 3 to which both the HARQ-ACK payload sizes of the FDD and TDD cells are applied. If the UE has not received the DL data of the FDD cell at subframe #n at operation 412, it may not transmit the control information corresponding to the DL data of the FDD cell at subframe #(n+4) of the FDD cell at operation 414.
- the UE transmits the control information corresponding to the DL data of the FDD cell at subframe #(n+4) at operation 414.
- the UE transmits the control information corresponding to the DL data of the FDD cell using the PUCCH format 1a/1b.
- the UE transmits only the control information corresponding to the DL data of the FDD cell, instead of all the control information corresponding to the DL data of the FDD and TDD cells to which the HARQ-ACK payload sizes of both the FDD and TDD cells are applied, in the PUCCH format 3. If it fails to receive the DL data of the FDD cell at subframe #n at operation 412, the UE may not transmit the control information corresponding to the DL data of the FDD cell at #(n+4) of the FDD cell at operation 414.
- the UE transmits the control information corresponding to the DL data of the FDD cell and the control information corresponding to the DL data of the TDD cell together at subframe #(n+4) at operation 415.
- the UE transmits the control information corresponding to the DL data of the FDD cell and the control information corresponding to the DL data of the TDD cell in the PUCCH format 1b with channel selection.
- the UE transmits all the control information corresponding to the DL data of the FDD and TDD cells in the PUCCH format 3 to which the HARQ-ACK payload sizes of both the FDD and TDD cells are applied.
- FIG. 5 is a diagram illustrating an eNB apparatus according to an embodiment of the present disclosure.
- the eNB apparatus includes a transmitter having a PDCCH block 505, a PDSCH block 516, a physical HARQ indicator channel (PHICH) block 524, and a multiplexer 515; a receiver having a PUSCH block 530, a PUCCH block 539, and a demultiplexer 549; a controller 501 controlling the PUCCH transmission format, and a scheduler 503.
- a transmitter having a PDCCH block 505, a PDSCH block 516, a physical HARQ indicator channel (PHICH) block 524, and a multiplexer 515
- PHICH physical HARQ indicator channel
- the eNB apparatus includes a transmitter having a PDCCH block 505, a PDSCH block 516, a physical HARQ indicator channel (PHICH) block 524, and a multiplexer 515; a receiver having a PUSCH block 530, a PUCCH block 539, and a demultiplexer 549; a controller 501 controlling
- the DL/UL HARQ transmission/reception timing includes the PUCCH transmission timing corresponding to the PUSCH transmission
- the PUCCH transmission formats include PUCCH format 1b with channel selection, PUCCH format 3, and PUCCH format 1a/1b.
- the controller 501 which controls DL/UL HARQ-ACK transmission/reception and determines the PUCCH transmission cell adjusts the timing relationships among the physical channels for the use to be scheduled based on the data amount to be transmitted to the UE and the resource amount available in the system and notifies the adjustment result to the scheduler 503, PDCCH block 505, PDSCH block 516, PHICH block 524, PUSCH block 530, and PUCCH block 539.
- the DL/UL HARQ-ACK transmission/reception timing and PUCCH transmission cell are determined according to the method described in the above embodiments.
- the PDCCH block 505 configures the control information under the control of the scheduler 503, and the control information is multiplexed with other signals at the multiplexer 515.
- the PDSCH block 516 generates data under the control of the scheduler 503, and the data are multiplexed with other signals at the multiplexer 515.
- the PHICH block 524 generates HARQ ACK/negative ACK (NACK) corresponding to the PUSCH received from the UE under the control of the scheduler 503.
- NACK HARQ ACK/negative ACK
- the HARQ ACK/NACK is multiplexed with other signals at the multiplexer 515.
- the multiplexed signals are processed into an OFDM signal so as to be transmitted to the UE.
- the PUSCH block 530 of the receiver acquires PUSCH data from the received signal. It notifies the scheduler 503 of the presence/absence of error in the decoding result of the PUSCH data to adjust the DL HARQ ACK/NACK generation and sends the information on the presence/absence of error in the decoding result to the controller 501 which controls the DL/UL HARQ-ACK transmission/reception timing so as to adjust the DL HARQ ACK/NACK transmission timing.
- the PUCCH block 539 acquires UL ACK/NACK or channel quality indicator (CQI) from the signal transmitted by the UE in the PUCCH transmission cell according to the DL/UL HARQ-ACK transmission/reception timing.
- the acquired UL ACK/NACK or CQI is sent to the scheduler 503 for use in determining whether to retransmit PDSCH and modulation and coding scheme (MCS).
- MCS modulation and coding scheme
- the acquired UL ACK/NACK is sent to the controller 501 for use in adjusting the PDSCH transmission timing.
- FIG. 6 is a diagram illustrating the UE apparatus according to an embodiment of the present disclosure.
- the UE includes a transmitter having a PUCCH block 605, a PUSCH block 616, and a multiplexer 615; a receiver having a PHICH block 624, a PDSCH block 630, a PDCCH block 639, and a demultiplexer 649; and a controller for determining the PUCCH transmission cell by receiving DL data from the two eNBs according to the present disclosure.
- a transmitter having a PUCCH block 605, a PUSCH block 616, and a multiplexer 615 the UE includes a transmitter having a PUCCH block 605, a PUSCH block 616, and a multiplexer 615; a receiver having a PHICH block 624, a PDSCH block 630, a PDCCH block 639, and a demultiplexer 649; and a controller for determining the PUCCH transmission cell by receiving DL data from the two eNBs according to the present disclosure.
- the description is made under the assumption that there
- the controller 601 which determines the PUCCH transmission cell and whether to perform PUCCH transmission according to the present disclosure notifies the PUCCH block 605, PDSCH block 630, and PDCCH block 639 of the eNB and the cell for receiving PDCCH in self-scheduling or cross carrier scheduling based on the downlink control information (DCI) received from the eNB.
- the PUCCH transmission cell is determined according to the method described in the various embodiments of the present disclosure.
- the PUCCH block 605 configures HARQ ACK/NACK or CQI into uplink control information (UCI) under the control of the controller 601 which controls storing DL data in the soft buffer, and the HARQ ACK/NACK or CQI is multiplexed with other signals at the multiplexer 615 and then transmitted through the PUCCH transmission cell determined according to the present disclosure.
- UCI uplink control information
- the PUSCH block 616 extracts data to be transmitted, and the extracted data are multiplexed with other signals at the multiplexer 615.
- the multiplexed signals are processed into the single carrier FDMA (SC-FDMA) signal so as to be transmitted to the eNB.
- SC-FDMA single carrier FDMA
- the PHICH block 624 of the receiver separates the PHICH signal from the signal transmitted by the eNB according to the DL/UL HARQ-ACK transmission/reception timing by means of the demultiplexer 649 and then acquires HARQ ACK/NACK corresponding to the PUSCH.
- the PDSCH block 630 separates the PDSCH signal from the signal transmitted by the eNB through the demultiplexer 649, acquires PDSCH data, and notifies the PUCCH block 605 of the presence/absence of error in the decoding result to generate UL HARQ ACK/NACK and sends the presence/absence of error in the decoding result to the controller 601 to adjust the timing for transmitting UL HARQ ACK/NACK.
- the PDCCH block 639 separates the PDCCH signal through the demultiplexer 649 and performs DCI format decoding to acquire DCI from the decoded signal.
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Abstract
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KR102323001B1 (ko) | 2021-11-08 |
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CN107027344A (zh) | 2017-08-08 |
AU2015340135A1 (en) | 2017-05-04 |
US10306612B2 (en) | 2019-05-28 |
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CN107027344B (zh) | 2021-09-03 |
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